2020 Open de Rennes – Singles

Ričardas Berankis was the defending champion but chose not to defend his title.

Arthur Rinderknech won the title after defeating James Ward 7–5, 6–4 in the final.

Seeds
All seeds receive a bye into the second round. • # 🇺🇦 Sergiy Stakhovsky (third round)

• # 🇩🇪 Oscar Otte (second round)

• # 🇷🇸 Danilo Petrović (semifinals)

• # 🇸🇰 Lukáš Lacko (second round)

• # 🇫🇷 Maxime Janvier (second round)

• # 🇷🇺 Alexey Vatutin (third round)

• # 🇪🇸 Bernabé Zapata Miralles (second round)

• # 🇫🇷 Tristan Lamasine (third round)

• # 🇩🇪 Mats Moraing (third round)

• # 🇫🇷 Constant Lestienne (quarterfinals)

• # 🇫🇷 Alexandre Müller (second round, retired)

• # 🇪🇸 Roberto Ortega Olmedo (quarterfinals)

• # 🇩🇪 Tobias Kamke (semifinals)

• # 🇷🇺 Pavel Kotov (second round)

• # 🇹🇷 Cem İlkel (quarterfinals)

• # 🇦🇹 Lucas Miedler (second round)